=== BEGIN ARTIFACT FEATURE-VALUE-004.md ===
# FEATURE: Type and Numeric Primitives

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Provide jq type, length, numeric conversion, predicate, and math primitives. |
| Depends On  | ARCHITECTURE.md, FEATURE-VALUE-001.md, FEATURE-VALUE-003.md |
| Provides    | type, length, utf8bytelength, numeric predicates, conversions, math builtins |
| Consumes    | jq value model, ordered generator evaluator |

## Questions

- None.

## Intent

Implement `type`, `length`, `utf8bytelength`, numeric predicates, `tonumber`, `toboolean`, `tostring`, and the standard math functions exercised by the corpus. Preserve jq's stream behavior, numeric equivalence, Unicode codepoint semantics, and runtime errors for invalid input types.

## Programmatic Acceptance

=== AC value-004-conformance ===
Intent: The implementation passes the authoritative corpus slice covering type, length, numeric predicates, conversions, and math functions.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

select = r"length|type|sqrt|floor|tonumber"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", select, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC value-004-conformance ===

## User Acceptance

- None.

## Guardrails

- Use only Python standard-library facilities.
- Preserve jq's distinction between booleans and numbers.
- Do not replace authoritative corpus verification with hand-picked examples.

=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-FLOW-001.md ===
# FEATURE: Arithmetic and Structural Operators

| Field       | Value |
|-------------|-------|
| Version     | 20220822 V1 |
| Description | Provide jq arithmetic, structural merge, repetition, splitting, and negation operators. |
| Depends On  | ARCHITECTURE.md, FEATURE-VALUE-004.md |
| Provides    | plus, minus, multiply, divide, modulo, negation, recursive merge, repetition, splitting |
| Consumes    | jq value model, ordered generator evaluator |

## Questions

- None.

## Intent

Implement jq's typed `+`, `-`, `*`, `/`, and `%` operators, unary negation, recursive object merge, array subtraction, string repetition, string splitting, and associated runtime errors. Operators must preserve generator Cartesian-product semantics and jq numeric behavior.

## Programmatic Acceptance

=== AC flow-001-conformance ===
Intent: The implementation passes the authoritative corpus slice covering arithmetic and structural operators.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

select = r"\+|\-|\*|/|%"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", select, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC flow-001-conformance ===

## User Acceptance

- None.

## Guardrails

- Do not perform implicit type conversions.
- Preserve partial output before runtime failures.
- Do not shell out to a system jq implementation.

=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-FLOW-002.md ===
# FEATURE: Boolean and Alternative Operators

| Field       | Value |
|-------------|-------|
| Version     | 20220822 V1 |
| Description | Provide jq Boolean, negation, defined-or, and defined-or assignment operators. |
| Depends On  | ARCHITECTURE.md, FEATURE-FLOW-001.md |
| Provides    | and, or, not, defined-or, defined-or assignment |
| Consumes    | ordered generator evaluator, truthiness and comparison |

## Questions

- None.

## Intent

Implement `and`, `or`, `not`, `//`, and `//=` with jq truthiness and generator-aware short-circuiting. False and null are falsey; all other values are truthy. Alternative expressions must emit all valid left-hand outputs or fall back to the right-hand generator.

## Programmatic Acceptance

=== AC flow-002-conformance ===
Intent: The implementation passes the authoritative corpus slice covering Boolean and alternative operators.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

select = r"and|or|not|//"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", select, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC flow-002-conformance ===

## User Acceptance

- None.

## Guardrails

- Do not use host-language truthiness in place of jq truthiness.
- Preserve ordering and multiplicity of generator outputs.
- Preserve short-circuit behavior where required.

=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-FLOW-003.md ===
# FEATURE: Conditionals and Exception Flow

| Field       | Value |
|-------------|-------|
| Version     | 20220822 V1 |
| Description | Provide jq conditional branching, try/catch handling, and optional evaluation. |
| Depends On  | ARCHITECTURE.md, FEATURE-FLOW-002.md |
| Provides    | if, then, elif, else, try, catch, optional control flow |
| Consumes    | ordered generator evaluator, runtime error model |

## Questions

- None.

## Intent

Implement `if`/`then`/`elif`/`else`/`end`, `try`/`catch`, and the `?` optional operator. Branches must run once per condition output, preserve generator ordering, suppress only the errors requested by the filter, and retain outputs produced before an uncaught runtime error.

## Programmatic Acceptance

=== AC flow-003-conformance ===
Intent: The implementation passes the authoritative corpus slice covering conditionals, try/catch, and optional evaluation.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

select = r"if |try |\?"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", select, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC flow-003-conformance ===

## User Acceptance

- None.

## Guardrails

- Keep compile failures distinct from runtime failures.
- Do not compare or normalize diagnostic text as a correctness oracle.
- Preserve partial stdout output before runtime failure.

=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-FLOW-004.md ===
# FEATURE: Labels and Breaks

| Field       | Value |
|-------------|-------|
| Version     | 20220822 V1 |
| Description | Provide lexically scoped jq labels and break control flow. |
| Depends On  | ARCHITECTURE.md, FEATURE-FLOW-003.md |
| Provides    | label and break control flow |
| Consumes    | ordered generator evaluator, runtime error model |

## Questions

- None.

## Intent

Implement `label $name | ...` and `break $name` with lexical scope. A break must terminate only its corresponding enclosing generator, suppress subsequent outputs from that scope, and compile-fail when no visible label exists.

## Programmatic Acceptance

=== AC flow-004-conformance ===
Intent: The implementation passes the authoritative corpus slice covering labels and breaks.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

select = r"label|break"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", select, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC flow-004-conformance ===

## User Acceptance

- None.

## Guardrails

- Labels are lexical, not dynamically resolved.
- Break must not leak outputs from the terminated generator.
- Reject undefined labels at compile time with exit code 3.

=== END ARTIFACT ===